linux/arch/s390/boot/trampoline.S

/* SPDX-License-Identifier: GPL-2.0 */

#include <linux/linkage.h>

# This function is identical to __load_psw(), but the lx-symbols GDB command
# puts a breakpoint on it, so it needs to be kept separate.
SYM_CODE_START(jump_to_kernel)
	lpswe 0(%r2)
SYM_CODE_END(jump_to_kernel)
s390/boot: Introduce jump_to_kernel() function Introduce a global function that jumps from the decompressor to the decompressed kernel. Put its address into svc_old_psw, from where GDB can take it without loading decompressor symbols. It should be available throughout the entire decompressor execution, because it's placed there statically, and nothing in the decompressor uses the SVC instruction. Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Tested-by: Alexander Gordeev <agordeev@linux.ibm.com> Link: https://lore.kernel.org/r/20250625154220.75300-2-iii@linux.ibm.com Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> 2025-06-25 17:36:51 +02:00			`/* SPDX-License-Identifier: GPL-2.0 */`

			`#include <linux/linkage.h>`

			`# This function is identical to __load_psw(), but the lx-symbols GDB command`
			`# puts a breakpoint on it, so it needs to be kept separate.`
			`SYM_CODE_START(jump_to_kernel)`
			`lpswe 0(%r2)`
			`SYM_CODE_END(jump_to_kernel)`